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English definition of “block sth up”

block sth up

phrasal verb with block     /blɒk/ US  /blɑːk/ verb [T]
to fill a narrow space with something so that nothing can pass through: In autumn, leaves block the drains up.Closing and blocking
(Definition of block sth up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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